[Asterisk-Dev] Ethernet buffering problems causing jitter

[Jim Burnes]

On Thu, Mar 18, 2004 at 04:58:39PM -0800, Mike Nugent wrote:
> 
> Last week we were experiencing lots of jitter due to our firewall not
> handling packets smoothly.
> 
> The firewall has two 82557's on it.
> 
> In order to fix this, I used the e100 module and set RxDescriptors and
> TxDescriptors to 1024 and flow_control to 1.
> 
Mike,

(I'm assuming you are using Linux as your firewall OS.)

You might actually get better performance still if you schedule your
asterisk traffic as high priority using the iptables QOS functions.

My personal preference is OpenBSD pf because I think it allows for a lot
more flexibility.  I have all my VOIP traffic scheduled in the realtime queue,
priority 1.

As I work on my Asterisk Python/Twisted GUI, I'm going to see if I can
throw in some hooks over to 'pf' and see if it aids the admin in tuning
performance.

Good luck,

jburnes